triangle

tri·an·gle

noun \ˈtrī-ˌaŋ-gəl\

Definition of TRIANGLE

1

: a polygon having three sides — compare spherical triangle

2

a : a percussion instrument consisting of a rod of steel bent into the form of a triangle open at one angle and sounded by striking with a small metal rod b : a drafting instrument consisting of a thin flat right-angled triangle of wood or plastic with acute angles of 45 degrees or of 30 degrees and 60 degrees

3

: a situation in which one member of a couple is involved in a love affair with a third person

Examples of TRIANGLE

1. She cut the sandwiches into triangles.

Illustration of TRIANGLE

Origin of TRIANGLE

Middle English, from Anglo-French, from Latin triangulum, from neuter of triangulus triangular, from tri- + angulus angle

First Known Use: 14th century

Rhymes with TRIANGLE

embrangle, entangle, face angle, pentangle, quadrangle, rectangle, right angle, round angle, straight angle, untangle, wide-angle